Marble grinding and polishing machine



J. GIOMETTI MARBLE GRINDING AND POLISHING MACHINE Dec. 20, 19272 1,653,166

Filed Sept .15, 1925 Patented Ben. 20, 1. 927.

so STATES T NT I JOHN GIQMETTI, OF SAN FRANCISCO, CALIFORNIA.

ARBLE GRINDING Ann r'onrsnnve MACHINE.

'npplication filed September 5, 1925. Serial No, 54,588

This invention relates to a machine 'for dressing, grinding and pollshing various slab materials and is particularly adapted opoperated upon.

prises an automatically operated carriage moving on a fixed track and carrying all of the grinding and polishing mechanism of the apparatus, together with a suitable source of power and transmission devices for controlling the automatic movement of the carriage, while on each side of the fixed track in operative relation with the grinding and polishing mechanism, are placed work hold-' ing devices for holding and adjusting the slabs being operated upon relative tothe grinding mechanism.

It is therefore a principal object of the invcntion to provided a grindingandpolishing machine having means for holding thema terial which is being operated upon, in fixed relation to the movable operating means; to provide a grinding and polishing machine having a movable automatically controlled power unit moving through a controlled path and thereby maintained in operative relation with the material being operated upon and to provide in a grinding and polishing machine, means i'or adjusting the work to the grinding means that is independent of the moving carriage and that may be adjusted and manipulated-without stopping the grinding or polishing mechanism; means for automatically reversing the applicationof power and motion of the working elements; means for giving a lateral or vibratory movement to the grinding wheels to prevent ridging or grooving of the material and to produce a more uniform wear to the faces of the grinding and polishing elements together with means for maintaining a uniformtempera ture on the surface of the marble or other material operated upon.

he general assembly oi the machine coma With such objects in view as well as other advantages inherent in the invention, the novel structural peculiarities, novel organization of elemcnts,and the separate and collective "operations involved in carrying out my invention, which I will be made the subject matter of aclaim hereto appended, I

Wish understood that the several necessary elements and combinations constituting the 'samemay be varied in their proportions,

placement, general arrangement and operative relationi without departing i from the scope'a'nd nature oimy invention.

ln'referrlng now to the drawings accompanying this application where a clearer and better understanding of the general arrangemerit and operation o't theinvention will be had, Iwant to point vout that the drawings,

are more or' less diagrammatic in character;

are not necessarily drawn to scale, neither do they necessarily represent the best engineering practices in connection with the construotion ofthistype of apparatus, also that the proportions and, relations of some of the parts may be more'or less exaggerated in sizeand shape to better illustrate the application of the invention to an operative apparatus.

Fig. 1 represents a plan of an apparatus embodying my invention;

Fig. 2 represents an end elevation of the apparatus of Fig. l, butshowing in addition the'wat'er tank located over the grinding elements, which was'omitted from Fig; 1 for purpose of clarity.

Fig. 3 is a detail looking in the direction of the'arrow 3 of Fig. 2 and shows the rela tion of the water nozzles to the grinding,

wheels and the work as well as the adjusting means for moving the slab of'inarble or other material into operative relation with the grinding wheels.

The general arrangement of themachine illustrated as embodying my inventioncom-c Ito prises a carriage 1 mounted on four ordinary car wheels and moving on an ordinary track. On t-his carriage is mounted a source of power, in this instance an electric motor deriving its current from a third rail, as at 2, Fig. 2. The electric motorS is located about midway ofthe carriage and carries'a mitre gear on its armature shaft indicated at 4, this gear meshes with two mating gears 5 and 6,

the inner faces of each of the gears 5 and 6 being provided with clutching means to operate with the clutch block 7 located therebetween. The gears 5 and 6 are located on a longitudinally located shaft 8, one end of said shaft 8 carrying an additional mitre gear 9 meshing with a gear 10 on a horizontally located shaft 11, which shaft 11 constitutes the grinding shaft and carries on each of its outer ends the grinding or polishing wheels 12 and 13. The grinding shaft 11 is mounted for limited .longitudinal or axial reciprocation by means of bushing members ll or other anti-friction bearings. The opposite end of the shaft 8 carries a worm 14: meshing with a worm wheel 15 lo cated on the axle 16 which serves to move the carriage 1 along the track.

The clutch block 7 is controlled by the lever arm 17 pivoted as shown, and having one end connected with the shift rod 18 on either end of which is carried a tappet 19. Located at suitable distances apart are sta tionary shift blocks and 21 against which the tappets 19 impact at each end ofthe carriage stroke and thereby cause the shift bar to move and shift the clutch block into engagement with either the gear 5 or 6 and thus cause the carriage to reverse its direction of movement. The shift blocks 20 and 21am shown in Fig. 1 as up close to the tappets on each end. This is not their cor rect operative location they were merely placed here in order to get them on the space within the margin of the drawing so they could be identified with a proper character. In operation they would be placed far enough apart to. permit the carriage to traverse the length desired to grind any given length of slab, and they would be adjustably mounted in any well known manner.

It is the tendency of grinding and bufling wheels to heat the material on which they may be operating-and to maintain a comparatively. uniform temperature and condition of operation I direct streams of water onto the surfaces under the wheels to keep them cool. l Vater or other suitable cooling liquid 0 air under pressure if desired may be supplied from the tank 22 and. nozzles 23. Also in grinding and butling' material of the character described it is desirable to give a slight lateral movement to the grinding wheels during their operation. This is accomplished by providing a vibrating meniber 24 which may be constituted of a disk member or cam having transverse corrugations as illustrated. The vibrating member or cam 24 is seemed to the frame or carriage l, for example by means of a boss member or projection 30. The member 24 is centrally apertured to receive loosely the shaft 11 and the latter hasrigidly secured thereto a collar member 31 having trans verse corrugations conforming with those on the vibrating or oscillating member 24;. From the above it will be apparent that when the shaft 11 rotates the corrugations of the collar member 31 are alternately in and out of engagement with the deepest portions of the corrugations on the disk member 24, thereby giving a limited axial oscillatory movement to the shaft 11. In order to prevent the unmeshing of the gears 9 and 10 while the shaft is oscillating axially I mount the gear 10 on a spline and hold it in mesh with the gear 9 by means of the bearing bracket This permits the shaft 11 to have free/axial movement under the action of the vibrator member 24.

The marble slab or other material is indicated at :26 and is held in operative position by the adjust-able brackets 27; adjusted by means of the hand operated screws 28. lVhen an adjustment ismade the bracketis securely bolted tothe supporting member 29.

The operation of the machine is so easily apparent from the description just j'given that an ,operative description seems unnecessary. i I j I have not illustrated any electrical cont-rol mechanism in connection with theoperation of the i'notor shown. All that seems necessary will be a simple controlling switch of any well known type, The carriage will start from any position and of course by ad justing and locating the shift blocks 20 and 2]. any length of travel of the carriage may be had to suit whatever length of slab is being operated upon.

I claim zr A material surfacing machine comprising carriage including supporting" wheels, tracks on which said wheels operate for movablysupporting said carriage, means ex tending parallel with the tracks for supporting materials to be operated upon, a motor on the carriage, a dri 'e shaft rotatably mounted on the carriage, a second shaft at right angles to the drive shaft, a driving connection between said drive shaft and the supporting wheels, a pair of selective drivingconnections between the drive shaft and motor, whereby the shaft is rotatable in either direction and including a clutch, said second shaft being mounted for lineal reciprocat-ion, one of the driving connections of said pair alternately rotating said drive shaft, anfluted disk carried by the second shaft, a fixed guide within which the disk operates vfor imparting lineal movement thereto during its rotation. surfacing devices on the ends of the second shaft overlying the material supporting means, a rod reciprocably mounted on the frame and connected with the clutch for operating the same, and stops for contacting with the rod on the movement of the carriage a predetermined distance in either direction.

In testimony whereof I have signed my name to this specification.

JOHN GIOMETTI.

Ice 

